squash match
Goldberg in a WCW ring is practically indestructible, because that's the way he was booked for so long. How can anyone even justify someone that found the majority of their success in the minor leagues even standing a chance against Goldberg in this situation? For almost 200 straight matches Goldberg went undefeated, and most of those wins were against guys like Castagnoli - jobbers. Despite his success on the Indy Circuit, Castagnoli probably would have been mid card at best in WCW, and would have been fed straight to Goldberg if the opportunity ever arose.
I didn't realize Goldberg had been placed in the WCW region, hell, unless he runs into Bret Hart, Sting, or Hogan within the next couple of rounds, I don't expect him to go out anytime soon.
Winner, Goldberg